CN109038957B - Shielded motor of half-stroke external cooling chamber for motor shell internal stator and shielded electric pump thereof - Google Patents
Shielded motor of half-stroke external cooling chamber for motor shell internal stator and shielded electric pump thereof Download PDFInfo
- Publication number
- CN109038957B CN109038957B CN201710451303.9A CN201710451303A CN109038957B CN 109038957 B CN109038957 B CN 109038957B CN 201710451303 A CN201710451303 A CN 201710451303A CN 109038957 B CN109038957 B CN 109038957B
- Authority
- CN
- China
- Prior art keywords
- motor
- stator
- shell
- cooling
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Compared with the whole-course outer cooling chamber structure of the stator, the shielding motor and the shielding electric pump of the half-course outer cooling chamber for the stator in the motor shell keep the good tight assembly function and the deformation-resistant integral rigidity of the stator piece in the structure without the stator outer cooling chamber on the premise of keeping the cooling function of the inner cooling chamber at the high temperature section of the motor shell; compared with a stator structure without an external cooling chamber, the cooling function of the internal cooling chamber at the high-temperature section of the motor shell is added, and a cooling liquid opening arranged at the high-temperature section of the motor shell is transferred to the low-temperature section of the motor shell, so that the safety of the motor shell is improved; an overall optimized structure which gives consideration to multiple indexes of cooling, tight assembly and deformation-resistant integral rigidity of motor parts is formed, and the temperature and vibration application range of the canned motor pump is favorably expanded; the canned motor pump can be used as a slurry circulating pump with high temperature, high pressure and high solid concentration of a high-temperature liquid phase product reflux system of a gas-liquid material up-flow type coal hydrogenation direct liquefaction reactor.
Description
Technical Field
The invention relates to a shielding motor of a half-stroke external cooling chamber for a stator in a motor shell and a shielding electric pump thereof, compared with a stator full-stroke external cooling chamber structure, the shielding motor keeps good compact assembly function and deformation-resistant integral rigidity of a stator piece in the structure without the stator external cooling chamber on the premise of keeping the cooling function of an internal cooling chamber at a high-temperature section of the motor shell; compared with a stator structure without an external cooling chamber, the cooling function of the internal cooling chamber at the high-temperature section of the motor shell is added, and a cooling liquid opening arranged at the high-temperature section of the motor shell is transferred to the low-temperature section of the motor shell, so that the safety of the motor shell is improved; an overall optimized structure which gives consideration to multiple indexes of cooling, tight assembly and deformation-resistant integral rigidity of motor parts is formed, and the temperature and vibration application range of the canned motor pump is favorably expanded; the canned motor pump can be used as a slurry circulating pump with high temperature, high pressure and high solid concentration of a high-temperature liquid phase product reflux system of a gas-liquid material up-flow type coal hydrogenation direct liquefaction reactor.
Background
The structure of the canned motor of present canned motor pump relates to the structural style of motor stator cooling, motor casing cooling, motor stator and motor casing assembly, has two kinds of structures that set up the whole outer cold chamber of stator and do not set up the outer cold chamber of stator, all has the unsatisfactory defect of comprehensive properties:
firstly, the canned motor pump is provided with a stator whole-course external cooling chamber structure, and has the advantages that an internal cooling chamber is formed in the whole course (a high-temperature section and a normal-temperature section) of a canned motor shell, but the internal cooling chamber is not needed in the normal-temperature section of the canned motor shell; because the shielding motor shell normal temperature section is arranged and the internal cooling chamber is not needed, the good tight assembly function of the stator part and the shielding motor shell and the deformation-resistant integral rigidity of the stator part are reduced, and the potential risk of increasing the radial vibration value of the shielding motor rotor exists;
the canned motor pump is not provided with a structure of a stator external cooling chamber, and has the advantages that the good tight assembly function of the stator part and the canned motor shell and the deformation-resistant integral rigidity of the stator part are enhanced, but the function forms an unnecessary excessive whole-process tight fit structure of the stator-shell; because the structure of the stator external cooling chamber is not arranged, a cooling liquid opening for shielding the high-temperature section of the motor shell must be arranged, and the safety of the high-voltage shielding motor shell is reduced; meanwhile, because an inner cooling chamber required by a shell of the high-temperature section of the canned motor is lacked, the upper temperature limit of the canned motor suitable for pumping process materials is inevitably limited, and the application range of the canned motor pump can be reduced.
The invention relates to a structural improvement of a circulating pump for a high-temperature, high-pressure and high-solid-content coal slurry reactor in a direct coal hydrogenation liquefaction process CTL, and aims to provide an overall optimized structure which gives consideration to multiple indexes of cooling, tight assembly and deformation-resistant overall rigidity of motor parts, so that the temperature and vibration application range of a shielding electric pump can be expanded, and the circulating pump for the coal slurry reactor with better comprehensive performance can be formed.
The basic idea of the invention is: compared with the whole-course outer cooling chamber structure of the stator, the shielding motor and the shielding electric pump of the half-course outer cooling chamber for the stator in the motor shell keep the good tight assembly function and the deformation-resistant integral rigidity of the stator piece in the structure without the stator outer cooling chamber on the premise of keeping the cooling function of the inner cooling chamber at the high temperature section of the motor shell; compared with a stator structure without an external cooling chamber, the cooling function of the internal cooling chamber at the high-temperature section of the motor shell is added, and a cooling liquid opening arranged at the high-temperature section of the motor shell is transferred to the low-temperature section of the motor shell, so that the safety of the motor shell is improved; an overall optimized structure which gives consideration to multiple indexes of cooling, tight assembly and deformation-resistant integral rigidity of motor parts is formed, and the temperature and vibration application range of the canned motor pump is favorably expanded; the canned motor pump can be used as a slurry circulating pump with high temperature, high pressure and high solid concentration of a high-temperature liquid phase product reflux system of a gas-liquid material up-flow type coal hydrogenation direct liquefaction reactor.
Since the shielded motor driven high temperature, high pressure, solid particle, heavy oil slurry containing hydrogenation reactor circulation pump has been around 50 years, no report similar to the present invention has been made for a long period of 50 years so far, and thus, the present invention has been of significant inventive interest.
Therefore, the invention aims to provide the shielding motor of the half-stroke external cooling chamber for the inner stator of the motor shell and the shielding electric pump thereof, which are beneficial to improving the comprehensive performance of the shielding electric pump and expanding the application range of the shielding electric pump and can be used for improving the comprehensive performance of a high-temperature, high-pressure and high-solid-content oil coal slurry circulating pump for a coal hydrogenation direct liquefaction reactor.
Disclosure of Invention
The invention relates to a shield motor of a half-stroke external cooling chamber for an inner stator of a motor shell, which is characterized by comprising the following parts:
high-temperature process materials pass through a pump shell of the impeller driven by the shielding motor, and the high-temperature pump shell transfers heat to a shielding motor shell; the part of the shielding motor shell close to the pump shell belongs to the high-temperature section of the motor shell, and the part of the shielding motor shell far away from the pump shell belongs to the low-temperature section of the motor shell;
at least a part of the cooling and lubricating liquid DJL flows through the gap between the motor stator and the motor rotor in the motor shell and also flows through a half-stroke external cooling chamber 35 of the motor stator;
inside the high temperature section of the shielding motor shell, an overflowing gap of a cooling lubricating liquid DJL circulation flow loop of the motor rotor is formed and is used as a half-stroke outer cooling chamber 35 of a motor stator and an inner cooling chamber of the high temperature section of the motor shell;
two openings for the cooling lubricating liquid DJL to enter and exit the motor shell are arranged, wherein the upper opening is positioned in the middle of the motor shell and positioned at the lower part of the half-stroke outer cooling chamber 35 of the motor stator;
the lower half part of the supporting piece of the stator of the shield motor and the motor shell are in close assembly and adjacent assembly relation;
cooling the lubricating fluid DJL, and circulating through a circulation loop;
in the circulation loop, at least a part of cooling lubricating liquid DJL flows through the gap between a motor stator and a motor rotor in the motor shell, flows through a half-way external cold chamber 35 of the motor stator, flows through a cooler arranged outside the motor shell, cold cooling lubricating liquid DJL discharged by the cooler enters the motor shell, hot cooling lubricating liquid DJL discharged by the motor shell enters the cooler, and is pressurized and circulated by an additional impeller driven by the motor rotor.
In the invention, normally, in the circulation loop, cold cooling lubricating fluid DJL discharged from the cooler enters the motor shell through an opening arranged on the motor bottom cover, flows through an additional impeller driven by the motor rotor, is pressurized, then flows upwards through a gap between the motor stator and the motor rotor, enters the half-way outer cold chamber 35 of the motor stator through a backflow flow channel outside the motor stator and inside the motor shell, flows downwards, passes through the half-way outer cold chamber 35 of the motor stator, then is discharged from the hot cooling lubricating fluid DJL of the motor shell, enters the cooler, and is discharged from the cooler for circulation.
In the present invention, a liquid ring chamber 35BLD may be provided at a portion where the half-stroke outer cooling chamber 35 of the motor stator is connected to the cooling liquid opening 2P2, for joining or distributing the liquid material.
According to the invention, the backflow flow channel and the motor shell can be of an integrated structure.
In the present invention, the solid portion of the lower half-way outer cooling chamber 35 may be integral with the motor housing or integral with the motor stator support.
The invention discloses a canned motor pump, which comprises a canned motor with the structure, and is characterized in that:
the special flushing liquid injected into the outer part of the motor shell flows through the special flushing liquid inlet 9P1, enters the motor shell to be contacted with the rotor, is mixed with the ascending material of the cooling and lubricating liquid DJL flowing through the gap between the motor stator and the rotor, then enters the pump shell to be mixed with the process material, and therefore the backflow prevention function of preventing the medium in the pump shell from flowing back to enter the motor chamber is achieved.
The shielding electric pump is characterized in that:
a throttling member 881 for generating pressure difference can be arranged, so that the cooling and lubricating liquid DJL flowing through the gap between the motor stator and the motor rotor can go upwards along the gap between the motor rotor and the throttling member 881 for pressure reduction, and then the cooling and lubricating liquid DJL is mixed with special flushing liquid and then enters the pump shell 10 to be mixed with process materials, and the cooling and lubricating liquid DJL with small flow is continuously discharged and enters the pump shell 10.
The shielding electric pump is characterized in that:
an impeller shaft root seal 885 may be used to prevent backflow of the medium within the pump housing into the bearing outer gap and into the motor housing.
The shielding electric pump is characterized in that:
the process material conveyed within the pump housing may be a highly corrosive or solids-containing material.
The shielding electric pump is characterized in that:
the technical material conveyed in the pump shell can be high-temperature and high-pressure slurry in the direct coal hydrogenation liquefaction reaction process, and the operation conditions are as follows: the temperature is 390 to 480 ℃, the pressure is 4.0 to 38.0MPa, and the solid concentration is 5 to 35 percent.
The invention also discloses a shielding motor, which is characterized in that:
the shielded motor can be a wet shielded motor or a dry shielded motor.
The invention also discloses a shielding motor, which is characterized in that:
the shielding motor can be a shielding motor with a heat shield or a shielding motor without a heat shield.
Drawings
FIG. 1 is a schematic structural diagram of a wet shielded motor without an external cooling chamber of an inner stator of a motor housing and a wet shielded electric pump formed by the wet shielded motor, and the wet shielded motor is a boiler water circulating pump for a power station boiler, wherein an impeller cavity overflowing process medium is boiler circulating water, the design pressure can reach 40MPa, and the design temperature can reach 500 ℃; the circulating cold water of the motor cavity is high-cleanliness water, the design pressure can reach 40MPa, the design temperature of the circulating cooling water in the motor shell is usually 30-60 ℃, and the circulating cooling water serves as cooling water and lubricating water in the motor shell.
As shown in fig. 1, the wet canned motor pump includes a pump end and a motor end.
As shown in FIG. 1, the pump end, including the space surrounded by the pump housing 10 and the high temperature end face of the heat shield 2101, the boiler water from the boiler flows into the diffuser 15 through the inlet port 1P1 at the top of the pump housing, then enters the inlet of the impeller 16, is discharged out of the impeller after being energized by the impeller, flows into the guide part at the lower part of the diffuser, enters the pump housing for stabilizing the flow, is discharged out of the pump housing 10 through the boiler water discharge port 1P2, and is discharged to the boiler through the boiler water circulation system. As shown in fig. 1, 61 is an antifouling structure.
As shown in fig. 1, the motor end includes a space surrounded by the motor housing 21 and the bottom end cover 22, circulating cooling water from a heat exchanger outside the pump body enters the motor housing from a circulating cooling water inlet 2P1 of the bottom end cover of the motor, is pressurized by the rotating auxiliary impeller and then enters a gap between the motor rotor 62 and the motor stator 51 to lubricate and cool the rotor and the stator, and the circulating cooling water flows through the upper guide bearing 63 and then enters the annular water chamber 64 and is discharged out of the motor housing through the cooling liquid opening 2P 2. Coolant opening 2P2 is located below the heat shield at the high temperature end of the upper portion of motor housing 21.
As shown in fig. 1, the heat transferred from the pump end is transferred to the lower part of the motor housing through a heat shield part 2101 of the motor housing, and the heat shield has the function of reducing the heat transfer amount, and the outside of the heat shield has a certain degree of natural air cooling function.
The canned motor pump without the stator external cooling chamber shown in fig. 1 lacks an internal cooling chamber required by a high-temperature section of a canned motor housing due to the absence of the stator external cooling chamber, and the upper temperature limit of the canned motor suitable for pumping process materials is inevitably limited, so that the application range of the canned motor pump is reduced; in addition, the coolant opening 2P2 must be arranged at the high-temperature section of the shield motor case, reducing the safety of the high-voltage shield motor case.
The shielding motor who does not set up the outer cooling chamber of stator that figure 1 shows, because do not set up the outer cooling chamber of motor stator, the effective heat transfer area that its motor casing unit volume has is lower, to the big recirculated cooling water operating mode of heat transfer coefficient, the heat transfer cooling area that this structure provided is enough big and has the advantage that the structure is concise, but to the little recirculated cooling oil operating mode of heat transfer coefficient, the heat transfer cooling area that this structure provided is not enough relatively, need enlarge its heat transfer cooling area, under the prerequisite that other functions of guaranteeing the motor are not weakened, need to change and optimize motor casing cooling structure form, no person leads to motor casing diameter or volume to increase by a wide margin.
As shown in fig. 1, 103 is a main bolt nut for connecting the pump housing 10 and the heat shield 2101, 52 is an anti-erosion structure at the upper end of the motor stator, 65 is a lower guide bearing, 67 is a thrust bearing, 91 is a junction box, 92 is a lead wire conductive connector, and 2251 is a main bolt nut at the bottom cover side.
Fig. 2 is a functional schematic diagram of a technical scheme of the 1 st structure of the canned motor with the half-way external cooling chamber for the stator in the housing and the canned electric pump thereof of the present invention, which is a boiler water circulating pump for a power station boiler, and is different from the technical scheme shown in fig. 1 without the motor stator external cooling chamber in that the half-way external cooling chamber 35 for the stator in the housing of the canned motor is used, and the good tight assembling function of the stator member and the canned motor housing and the deformation-resistant integral rigidity of the stator member are maintained while the half-way external cooling chamber for the stator required by cooling the high temperature section of the motor housing is added. The shielding motor with the structure can provide larger cooling area of the motor shell, so the shielding motor can also be applied to the transportation of high-temperature oil products, such as the shielding motor used as a coal slurry circulating pump for a coal hydrogenation direct liquefaction reactor, and the main purpose of the invention is also realized.
As shown in fig. 2, using assembly 105, having the combined function of upper guide bearing support sleeve and return flow path, shown as baffle 1051, the circulating coolant that flows up through the gap between motor rotor 62 and anti-erosion structure 52 enters annular water chamber 64, and a portion of the circulating coolant flows down through baffle 1051, down into the horizontal annular chamber of motor housing half-way outer cold chamber 35, around, then down into the lower portion of motor housing half-way outer cold chamber 35, and then collects and exits the motor housing through coolant opening 2P 2.
As shown in fig. 2, the technical solution of the 1 st structure of the present invention is characterized in that:
the part of the baffling channel 1051 is a part of the upper guide bearing support sleeve, and as shown in fig. 2, a part of the space of the horizontal ring chamber of the half-way outer cooling chamber 35 is recessed into the solid body of the upper guide bearing support sleeve;
the solid part of the half-way external cooling chamber 35, which is vertical to the lower part of the annular cylinder chamber, is integrated with the motor stator support shell, that is, the main body size of the inner wall of the motor shell, which is adjacent to the stator, is the same diameter from top to bottom, so that the machining target and the machining procedure in the motor shell are simplified, and meanwhile, the thickness of the motor stator support shell belongs to a structure with a thin upper part and a thick lower part, but the machining difficulty is low. The motor stator support housing is a complete cylinder but is divided into two sections 511, 512 which are thin at the top and thick at the bottom.
FIG. 3 is a schematic view of the structure and function of the shielded motor and its shielded electric pump of the half-stroke external cold chamber for the stator in the housing according to the present invention, which is a boiler water circulating pump for a utility boiler, and can also be applied to the transportation of high temperature oil products, such as the shielded motor used as a coal slurry circulating pump for a coal hydrogenation direct liquefaction reactor; the difference from the technical solution of the invention 1 shown in fig. 2 is that a liquid ring chamber 35BLD is provided at a portion where the cooling chamber 35 is connected to the cooling liquid opening 2P2 in the half-way of the motor housing; the structure is beneficial to realizing the uniformity and symmetry of material distribution in the vertical annular chamber of the cold chamber 35 outside the half stroke of the motor shell and weakening the bias flow problem caused by the deviated arrangement of the cooling liquid opening.
FIG. 4 is a schematic diagram showing the 3 rd structural function of the canned motor and canned motor pump for the half-stroke external cooling chamber of the stator inside the housing according to the present invention, which is a boiler water circulating pump for a utility boiler, and can also be applied to the delivery of high-temperature oil products, such as a canned motor used as a slurry circulating pump for a coal hydrogenation direct liquefaction reactor; the difference from the 2 nd structural solution of the present invention shown in fig. 3 is that the portion of the baffling channel 1051 is a structural portion inside the motor housing, and is adjacent to and in a separated assembly relationship with the upper guide bearing bushing, and forms a sealing structure with each other, so that the structure of the upper guide bearing support sleeve is simplified, and the machining target and the machining procedure inside the motor housing become complicated, but the overall assembly relationship becomes simple and more reliable. As shown in fig. 4, the sealing relationship between the two is a bevel sealing relationship.
FIG. 5 is a schematic diagram showing the 4 th structural function of the canned motor and canned motor pump of the half-stroke external cooling chamber for the stator inside the housing according to the present invention, which is a boiler water circulating pump for a utility boiler, and can also be applied to the delivery of high-temperature oil products, such as a canned motor used as a slurry circulating pump for a coal hydrogenation direct liquefaction reactor; the difference from the 3 rd structural solution of the present invention shown in fig. 4 is that the solid part located right below the vertical annular cylindrical chamber of the half-way outer cooling chamber 35 is integrated with the motor housing, i.e. the diameter phi 5 is smaller than the diameter phi 4, i.e. the main body size of the inner wall of the motor housing adjacent to the stator is large at the top and small at the bottom, so that the machining target and the machining program in the motor housing will be partially different, and the thickness of the motor stator support housing will be uniform at the top and bottom and the lower part will be thinner for the convenience of machining.
FIG. 6 is a schematic diagram showing the 5 th structural function of the canned motor and canned motor pump for the half-stroke external cooling chamber of the stator inside the housing according to the present invention, which is used for the transportation of high-temperature oil, such as the canned motor used as a coal slurry circulating pump for a coal hydrogenation direct liquefaction reactor, and also applicable to a boiler water circulating pump for a power station boiler; compared with the technical scheme of the 4 th structure of the invention shown in the figure 5, the special flushing liquid feeding port 9P1 is added, the special flushing liquid injected from the outside of the motor shell enters the motor shell to contact with the rotor, and usually enters the pump shell to be mixed with the process material after being mixed with the upward cooling and lubricating liquid from the lower part of the motor, so as to realize the backflow prevention function of preventing the medium in the pump shell from flowing back to enter the motor chamber; as shown in fig. 6, a throttling member 881 for generating a pressure difference is provided, such as a labyrinth seal, so that the upward cooling and lubricating fluid is depressurized and then enters a special flushing fluid flow channel to prevent the special flushing fluid from flowing back to enter a space where a motor stator is located; to ensure proper operation, a small amount of cooling lubricant is continuously discharged into the pump housing.
As shown in fig. 6, the technical solution of the 5 th structure of the present invention has the following advantages: by using the special low-value flushing oil, the loss amount of the high-value special lubricating and cooling oil which circularly flows in the motor chamber can be greatly reduced on the premise of ensuring the normal long-term continuous work of the shield pump, and the investment is greatly saved; the method is particularly suitable for conveying high-temperature fluid containing corrosive components and abrasive components, such as a shielded motor used as a coal slurry circulating pump for a coal hydrogenation direct liquefaction reactor.
As shown in fig. 6, part of the lubricating coolant in the motor chamber flows into the pump housing in one direction as needed, and at this time, the lubricating coolant needs to be replenished into the motor housing, and the lubricating coolant is pressurized and replenished into the motor housing by using a reciprocating pump set.
FIG. 7 is a schematic view showing the 6 th structural function of the canned motor and canned motor pump for the half-stroke external cooling chamber of the stator inside the housing according to the present invention, which is used for the transportation of high-temperature oil, such as the canned motor used as a coal slurry circulating pump for the coal hydrogenation direct liquefaction reactor, and also applicable to a boiler water circulating pump for a boiler in a power station; the difference from the 5 th structural solution of the present invention shown in fig. 6 is that the impeller shaft root sealing member 885 such as labyrinth, baffle channel, etc. is used, and a special washing liquid is used to prevent the solid particles from flowing back into the bearing outer gap and the motor housing.
In fig. 1 to 7, the flow direction of the circulating cooling lubricant is the normal direction, but it is also possible to use a different flow direction, for example, the opposite direction, but the cooling effect is not optimal when the heated circulating cooling lubricant passes through the lower motor chamber.
In fig. 1 to 7, the shield motor is shown as a wet shield motor, but a dry shield motor may be used in the present invention.
In fig. 1 to 7, the canned motor is shown as a wet canned motor with a heat shield, but other configurations of wet canned motors or dry canned motors without a heat shield may be used with the present invention.
Detailed Description
The present invention is described in detail below.
The pressure in the present invention refers to absolute pressure.
The concentrations of the components described in the present invention, when not particularly specified, are weight concentrations, i.e., mass concentrations.
The centrifugal canned motor pump of the present invention is one canned motor driven centrifugal pump without environment sealing device of rotating shaft, and the canned motor may be wet canned motor or dry canned motor. In the centrifugal canned motor pump of the present invention, generally, the impeller is installed at the outward extending end of the motor shaft (in the pump impeller cavity), and the impeller, the pump shaft and the motor rotor jointly form a rotating part.
The centrifugal wet canned motor pump of the present invention, generally referred to as a centrifugal pump driven by a liquid-immersed canned motor, such as an oil-immersed canned motor pump for transporting oil products and a water-immersed canned motor pump for transporting boiler water, is characterized in that a "wet" stator is used, the stator winding being immersed in a liquid. At present, manufacturers of wet canned motor pumps in china include feijia motor technology development ltd, harbin electric group, HAYWARD TYLER electric canned motor pump ltd, and the like.
The dry canned motor pump of the present invention, which is generally considered to be developed after the advent of the wet canned motor pump, differs from the wet canned motor pump in that a dry canned motor is used. Generally, the inner surface of a dry type shielded motor stator is isolated by a non-magnetic corrosion-resistant sheet sleeve to form a stator shielded sleeve, the outer surface of a dry type shielded motor rotor is isolated by a non-magnetic corrosion-resistant sheet sleeve to form a rotor shielded sleeve, and power (torque between the stator and the rotor) is transmitted from the stator to the rotor through a magnetic force field; the stator shielding sleeve and the rotor shielding sleeve are pressure containers in nature, the end of the shielding sleeve is statically sealed by a flange or a welded structure and is separated from the conveyed liquid, so that the stator winding iron core and the rotor iron core are not corroded, and the stator shielding sleeve is filled with resin possibly. The shield is made of a non-magnetic, corrosion resistant, high strength metal material, typically hastelloy (hastelloy c) alloy. At present, manufacturers of dry canned motor pumps in China include Hefei Hu canned motor pump company, Dalian empire Gum canned motor pump company, HAYWARD TYLER electric canned motor pump company, and so on.
The wet shielded electric pump for conveying high-pressure fluid uses the wet shielded motor whose stator winding group is of liquid immersion type, so that the fixing component of the stator winding group can be non-pressure-bearing component, so that it can be made up by adopting thin metal plate, so that it is light in weight, small in volume and easy to assemble, so that in the interior of the pressure-bearing shell body of the wet shielded motor the internal and external cooling gaps of the stator can be conveniently formed, or called as cooling chamber or cooling channel, and the external cooling chamber of the stator can simultaneously bear the main cooling task of motor shell and heat shield, and the internal cooling chamber of the stator can simultaneously cool and lubricate motor rotor. The wet type canned motor pump is convenient for conveying high-temperature fluid because the cooling function is ideal.
The stator winding group of the dry type canned motor used for conveying high-pressure fluid is positioned in a pressure-resistant canned cover, so that the fixing component of the stator winding group is a pressure-bearing part and must be processed and manufactured by adopting a metal plate with thicker thickness, and therefore, the dry type canned motor has large weight and volume and is not easy to assemble, and thus, the inside of the pressure-bearing shell of the dry type canned motor can form an inner cooling gap and an outer cooling gap of a stator, but is not convenient. Generally, the dry canned motor pump does not have a stator external cooling chamber, but has a heat shield to limit the heat transfer amount from the pump casing to the motor casing, and the cooling liquid in the stator internal cooling chamber transfers the heat transferred by the heat shield at the position, close to the motor end, of the heat shield to realize the cooling of the motor casing.
The characteristic parts of the present invention are described below.
The invention relates to a shield motor of a half-stroke external cooling chamber for an inner stator of a motor shell, which is characterized by comprising the following parts:
high-temperature process materials pass through a pump shell of the impeller driven by the shielding motor, and the high-temperature pump shell transfers heat to a shielding motor shell; the part of the shielding motor shell close to the pump shell belongs to the high-temperature section of the motor shell, and the part of the shielding motor shell far away from the pump shell belongs to the low-temperature section of the motor shell;
at least a part of the cooling and lubricating liquid DJL flows through the gap between the motor stator and the motor rotor in the motor shell and also flows through a half-stroke external cooling chamber 35 of the motor stator;
inside the high temperature section of the shielding motor shell, an overflowing gap of a cooling lubricating liquid DJL circulation flow loop of the motor rotor is formed and is used as a half-stroke outer cooling chamber 35 of a motor stator and an inner cooling chamber of the high temperature section of the motor shell;
two openings for the cooling lubricating liquid DJL to enter and exit the motor shell are arranged, wherein the upper opening is positioned in the middle of the motor shell and positioned at the lower part of the half-stroke outer cooling chamber 35 of the motor stator;
the lower half part of the supporting piece of the stator of the shield motor and the motor shell are in close assembly and adjacent assembly relation;
cooling the lubricating fluid DJL, and circulating through a circulation loop;
in the circulation loop, at least a part of cooling lubricating liquid DJL flows through the gap between a motor stator and a motor rotor in the motor shell, flows through a half-way external cold chamber 35 of the motor stator, flows through a cooler arranged outside the motor shell, cold cooling lubricating liquid DJL discharged by the cooler enters the motor shell, hot cooling lubricating liquid DJL discharged by the motor shell enters the cooler, and is pressurized and circulated by an additional impeller driven by the motor rotor.
In the invention, normally, in the circulation loop, cold cooling lubricating fluid DJL discharged from the cooler enters the motor shell through an opening arranged on the motor bottom cover, flows through an additional impeller driven by the motor rotor, is pressurized, then flows upwards through a gap between the motor stator and the motor rotor, enters the half-way outer cold chamber 35 of the motor stator through a backflow flow channel outside the motor stator and inside the motor shell, flows downwards, passes through the half-way outer cold chamber 35 of the motor stator, then is discharged from the hot cooling lubricating fluid DJL of the motor shell, enters the cooler, and is discharged from the cooler for circulation.
In the present invention, a liquid ring chamber 35BLD may be provided at a portion where the half-stroke outer cooling chamber 35 of the motor stator is connected to the cooling liquid opening 2P2, for joining or distributing the liquid material.
According to the invention, the backflow flow channel and the motor shell can be of an integrated structure.
In the present invention, the solid portion of the lower half-way outer cooling chamber 35 may be integral with the motor housing or integral with the motor stator support.
The invention discloses a canned motor pump, which comprises a canned motor with the structure, and is characterized in that:
the special flushing liquid injected into the outer part of the motor shell flows through the special flushing liquid inlet 9P1, enters the motor shell to be contacted with the rotor, is mixed with the ascending material of the cooling and lubricating liquid DJL flowing through the gap between the motor stator and the rotor, then enters the pump shell to be mixed with the process material, and therefore the backflow prevention function of preventing the medium in the pump shell from flowing back to enter the motor chamber is achieved.
The shielding electric pump is characterized in that:
a throttling member 881 for generating pressure difference can be arranged, so that the cooling and lubricating liquid DJL flowing through the gap between the motor stator and the motor rotor can go upwards along the gap between the motor rotor and the throttling member 881 for pressure reduction, and then the cooling and lubricating liquid DJL is mixed with special flushing liquid and then enters the pump shell 10 to be mixed with process materials, and the cooling and lubricating liquid DJL with small flow is continuously discharged and enters the pump shell 10.
The shielding electric pump is characterized in that:
an impeller shaft root seal 885 may be used to prevent backflow of the medium within the pump housing into the bearing outer gap and into the motor housing.
The shielding electric pump is characterized in that:
the process material conveyed within the pump housing may be a highly corrosive or solids-containing material.
The shielding electric pump is characterized in that:
the technical material conveyed in the pump shell can be high-temperature and high-pressure slurry in the direct coal hydrogenation liquefaction reaction process, and the operation conditions are as follows: the temperature is 390 to 480 ℃, the pressure is 4.0 to 38.0MPa, and the solid concentration is 5 to 35 percent.
The invention also discloses a shielding motor, which is characterized in that:
the shielded motor can be a wet shielded motor or a dry shielded motor.
The invention also discloses a shielding motor, which is characterized in that:
the shielding motor can be a shielding motor with a heat shield or a shielding motor without a heat shield.
Claims (12)
1. The shield motor of the half-stroke external cooling chamber for the inner stator of the motor shell is characterized by comprising the following parts:
at least a part of cooling and lubricating liquid (DJL) flows through a gap between a motor stator and a motor rotor in the motor shell and also flows through a half-stroke external cooling chamber (35) of the motor stator;
inside the high temperature section of the shielding motor shell, an overcurrent gap of a cooling and lubricating liquid (DJL) circulation flow loop of the motor rotor is formed and is used as a half-stroke external cooling chamber (35) of a motor stator and an internal cooling chamber of the high temperature section of the motor shell;
two openings for the cooling and lubricating liquid (DJL) to enter and exit the motor shell are arranged, wherein the upper opening is positioned in the middle of the motor shell and positioned at the lower part of a half-stroke outer cooling chamber (35) of a motor stator;
the lower half part of the supporting piece of the stator of the shield motor and the motor shell are in close assembly and adjacent assembly relation;
a cooling lubricant (DJL) circulating through a circulation loop;
in the circulation loop, at least a part of cooling and lubricating liquid (DJL) flowing through a gap between a motor stator and a motor rotor in the motor shell flows through a cold chamber (35) outside the half-way of the motor stator and flows through a cooler arranged outside the motor shell, cold cooling and lubricating liquid (DJL) discharged by the cooler enters the motor shell, hot cooling and lubricating liquid (DJL) discharged by the motor shell enters the cooler and is pressurized and circulated by an additional impeller driven by the motor rotor.
2. The canned motor of claim 1, wherein:
in the circulation loop, cold cooling and lubricating liquid (DJL) discharged by a cooler enters a motor shell through an opening arranged on a motor bottom cover, flows through an additional impeller driven by a motor rotor, is pressurized and then flows upwards through a gap between a motor stator and the motor rotor, flows downwards through a return flow channel outside the motor stator and inside the motor shell, enters a half-way outer cold chamber (35) of the motor stator, and after passing through the half-way outer cold chamber (35) of the motor stator, hot cooling and lubricating liquid (DJL) discharged from the motor shell enters the cooler, and the cold cooling and lubricating liquid (DJL) discharged by the cooler circulates.
3. The canned motor of claim 1, wherein:
and a liquid ring chamber (35BLD) is arranged at the part of the half-stroke outer cooling chamber (35) of the motor stator, which is connected with the cooling liquid opening (2P2) and is used for converging or distributing liquid materials.
4. The shielded electric machine of claim 2, wherein:
the backflow flow channel and the motor shell are of an integrated structure.
5. The canned motor of claim 1, wherein:
the solid part of the lower part of the half-way external cooling chamber (35) is integrated with the motor shell or integrated with the motor stator support.
6. The canned motor of claim 1, wherein:
the shielded motor is a wet shielded motor or a dry shielded motor.
7. The canned motor of claim 1, wherein:
the shielding motor is a shielding motor with a heat shield or a shielding motor without a heat shield.
8. A canned electric pump comprising the canned motor of claim 1, 2, 3, 4 or 5, characterized in that:
the special flushing liquid injected into the outer part of the motor shell flows through the special flushing liquid inlet (9P1) and enters the motor shell to be contacted with the rotor, and is mixed with the ascending material of the cooling and lubricating liquid (DJL) flowing through the gap between the motor stator and the rotor, and then enters the pump shell to be mixed with the process material, so that the backflow prevention function of preventing the medium in the pump shell from flowing back to enter the motor chamber is realized.
9. The canned electric pump of claim 8, wherein:
and a throttling element (881) for generating pressure difference is arranged, so that cooling and lubricating liquid (DJL) flowing through a gap between a motor stator and a motor rotor ascends along the gap between the motor rotor and the throttling element (881) for pressure reduction, then is mixed with special flushing liquid and then enters a pump shell (10) to be mixed with process materials, and small-flow cooling and lubricating liquid (DJL) is continuously discharged and enters the pump shell (10).
10. The canned electric pump of claim 8, wherein:
the use of an impeller shaft root seal (885) prevents backflow of the medium within the pump housing into the bearing outer gap and into the motor housing.
11. The canned electric pump of claim 8, wherein:
the technical materials conveyed in the pump shell are highly corrosive or solid materials.
12. The canned electric pump of claim 8, wherein:
the technical material conveyed in the pump shell is high-temperature and high-pressure slurry in the direct coal hydrogenation liquefaction reaction process, and the operation conditions are as follows: the temperature is 390 to 480 ℃, the pressure is 4.0 to 38.0MPa, and the solid concentration is 5 to 35 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710451303.9A CN109038957B (en) | 2017-06-11 | 2017-06-11 | Shielded motor of half-stroke external cooling chamber for motor shell internal stator and shielded electric pump thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710451303.9A CN109038957B (en) | 2017-06-11 | 2017-06-11 | Shielded motor of half-stroke external cooling chamber for motor shell internal stator and shielded electric pump thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109038957A CN109038957A (en) | 2018-12-18 |
| CN109038957B true CN109038957B (en) | 2020-12-25 |
Family
ID=64630194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710451303.9A Active CN109038957B (en) | 2017-06-11 | 2017-06-11 | Shielded motor of half-stroke external cooling chamber for motor shell internal stator and shielded electric pump thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109038957B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111412145A (en) * | 2019-12-18 | 2020-07-14 | 合肥皖化电机技术开发有限责任公司 | Coal-to-liquid circulating pump |
| CN113417848A (en) * | 2021-07-01 | 2021-09-21 | 哈尔滨电气动力装备有限公司 | Heat shield with ceramic fiber structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2663698Y (en) * | 2003-11-20 | 2004-12-15 | 佳木斯电机股份有限公司 | Atmoseal type rolling bearing vertical shield electric pump |
| CN201332327Y (en) * | 2009-01-21 | 2009-10-21 | 合肥皖化电机技术开发有限责任公司 | Furnace water pump motor with cooling fin air cooling type heat shield |
| CN101630880A (en) * | 2008-07-15 | 2010-01-20 | 上海汉钟精机股份有限公司 | Motor device of cooling compressor |
| CN201466882U (en) * | 2009-07-29 | 2010-05-12 | 上海上电电机有限公司 | Motor air channel structure |
| CN202612122U (en) * | 2011-12-23 | 2012-12-19 | 吴昌龙 | Integral fully-enclosed type refrigeration vortex pump |
| CN204851745U (en) * | 2015-07-10 | 2015-12-09 | 合肥皖化电泵有限公司 | There is stove water pump of holding up positive axial to hold pump end high -temperature region |
-
2017
- 2017-06-11 CN CN201710451303.9A patent/CN109038957B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2663698Y (en) * | 2003-11-20 | 2004-12-15 | 佳木斯电机股份有限公司 | Atmoseal type rolling bearing vertical shield electric pump |
| CN101630880A (en) * | 2008-07-15 | 2010-01-20 | 上海汉钟精机股份有限公司 | Motor device of cooling compressor |
| CN201332327Y (en) * | 2009-01-21 | 2009-10-21 | 合肥皖化电机技术开发有限责任公司 | Furnace water pump motor with cooling fin air cooling type heat shield |
| CN201466882U (en) * | 2009-07-29 | 2010-05-12 | 上海上电电机有限公司 | Motor air channel structure |
| CN202612122U (en) * | 2011-12-23 | 2012-12-19 | 吴昌龙 | Integral fully-enclosed type refrigeration vortex pump |
| CN204851745U (en) * | 2015-07-10 | 2015-12-09 | 合肥皖化电泵有限公司 | There is stove water pump of holding up positive axial to hold pump end high -temperature region |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109038957A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8313316B2 (en) | Compressor system for underwater use having a stator packet with an annular cooling chamber | |
| US7371045B2 (en) | Pump apparatus and method | |
| TW201319394A (en) | Improved structure of corrosion-protection housing of permanent magnet canned pump | |
| JPH05187389A (en) | Motor pump | |
| CN107355389A (en) | Solar energy thermal-power-generating high-temperature long-shaft pump for liquid salts | |
| HUE030603T2 (en) | Cooling arrangement of a pump intended for pumping a liquid | |
| BRPI0709128A2 (en) | compressor unit | |
| CN109038957B (en) | Shielded motor of half-stroke external cooling chamber for motor shell internal stator and shielded electric pump thereof | |
| CN103629148A (en) | Horizontal self-cooling permanent magnet shield pump | |
| CN104976133A (en) | High temperature water pump of mechanical seal and vortex pump closed type self-circular system | |
| CN215419966U (en) | Motor internal cooling system and submersible motor | |
| CN104131982B (en) | Special rectifying device oil pump is planted in special transformer and integration | |
| CN110211712A (en) | A kind of vertical mixed flow pump for lead bismuth reactor-loop | |
| CN205977775U (en) | Chemical pump is supported at modified single -stage double suction, radial subdivision, both ends | |
| CN105443586B (en) | The cooling structure of electronic auxiliary feed water pump thrust bearing lubricating oil | |
| CN109139488B (en) | Canned motor's canned motor pump with special anti-backflow liquid cooling motor casing | |
| EP0178087A1 (en) | Submersible pump head cooling means | |
| CN111828336A (en) | Ultra-silent zero-leakage nuclear main pump/fan compressor integrated design scheme | |
| KR102112996B1 (en) | Turbo compressor supported only by inlet and outlet flanges | |
| CN103398012A (en) | Start-stop water feeding pump of nuclear power station | |
| CN109779918B (en) | Pump for small lead-based reactor | |
| CN210265139U (en) | Small-pile main pump | |
| CN204140670U (en) | A kind of water-cooled Hydrodynamic Sliding Bearing | |
| CN216077601U (en) | Corrosion-resistant canned motor pump | |
| JP5492866B2 (en) | Shaft seal device and pump device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |